[Bug c++/63904] New: ICE when acessing array member of constexpr struct

[gcc-bugzilla at bmevers dot de]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=63904

            Bug ID: 63904
           Summary: ICE when acessing array member of constexpr struct
           Product: gcc
           Version: 5.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: gcc-bugzilla at bmevers dot de

Created attachment 33994
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=33994&action=edit
Preprocessed source

The following code causes an internal compiler error:


template<int N>
struct foo {
    constexpr foo() : a() {}
    int a[N];
};

int main() {
    foo< (foo<1>{}).a[0] > f;
}


constexpr-initalization.cpp:7:25:   in constexpr expansion of
‘f.foo<N>::foo<0>()’
constexpr-initalization.cpp:7:25: internal compiler error: in tree_low_cst, at
tree.h:4849
 foo< (foo<1>{}).a[0] > f;